Supplemental Financial Information - Accounts Payable (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounts payable trade	$ 305	$ 277
Salaries, withholdings and payroll taxes	356	456
Ticket taxes and fees	475	242
Aircraft maintenance payable	82	65
Fuel payable	111	188
Dividends payable	107	107
Customer reimbursements and refunds	7	311
Accrued third party services	273	196
Other payable	166	162
Accounts payable	$ 1,882	$ 2,004